The CSO cleaning set optics allows a thorough and gentle cleaning of all optical lenses. The set consists of a lens cleaner, a cleaning brush, a dust blower and two microfiber cloths in different sizes - all practically packed in a high-quality bag. The set is particularly durable, so you can easily wash the microfiber cloths and the bag in the washing machine (40C/100F). Refill the glass bottle with the lens cleaner (fluid) at selected retailers. Besides, we are largely avoiding the use of plastics and are going for alternative materials such as bamboo or glass instead. Protect what you love - When you regularly clean the lenses, your device will keep its optical brilliance for a lifetime.